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Significant Accounting Policies - Accrued Liabilities (Details) - USD ($)
$ in Thousands
May 31, 2021
May 31, 2020
Accounting Policies [Abstract]    
Insurance reserve $ 156,447 $ 165,427
Employee benefit related liabilities 129,348 134,846
Dividends 79,135 0
Accrued interest 24,420 24,538
Other 129,560 131,842
Accrued liabilities $ 518,910 $ 456,653